Help me give Thor a fighting chance!

Hi, my name is Nicole and my baby boy Thor a 4 year old Rottweiler is extremely sick at the vet and they don’t really know what’s wrong. At this stage they’re just supporting him until his own body can start fighting again. My dogs are absolutely everything to me and I have been working so hard to find them and I a new home since my separation. I need Thor to be ok but his vet bill is costing me $5k a day at the moment. I’m trying to give him a fighting chance to come back home to me. Any help anyone can offer I would be forever grateful ❤️‍